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基于换热平衡方程和空气动力方程的耦合关系,建立无侧风条件下,自然通风湿式冷却塔的热力性能计算模型,并利用MATLAB程序,通过迭代运算方法,对两方程进行联立求解,从而获得与现场测试相同的气象和运行条件下,剔除侧风影响后冷却塔通风量和冷却数的应达值,然后结合现场测试得到的实际通风量和冷却数,提出了可以特异地反映侧风对冷却塔性能影响的新指标。某3 500 m2冷却塔的计算结果表明,在模型散热量和实测散热量相同的条件下,侧风影响会使得冷却塔的通风量最大减少38.5%,此时体积分数为33.9%的填料没有得到有效利用,侧风还会增加冷却塔的冷却任务,相应的,需要冷却塔具有更好的冷却性能,这对于了解侧风对冷却塔性能的影响以及指导冷却塔的设计与改造有重要意义。
Based on the coupling relationship between heat balance equation and aerodynamic equation, the calculation model of thermal performance of natural draft wet cooling tower with no side air is established. By using MATLAB program, the two equations are solved simultaneously by iterative method. The same value of the field test and the same operating conditions were obtained. After the influence of crosswind was removed, the value of ventilation and cooling of the cooling tower should be obtained. Based on the actual air volume and cooling number obtained from the field test, New indicator of cooling tower performance. The calculation results of a 3 500 m 2 cooling tower show that the crosswind effect can reduce the maximum cooling capacity of the cooling tower by 38.5% under the same heat dissipation of the model and the actual heat dissipation. In this case, the filler with a volume fraction of 33.9% is not obtained Effective utilization of the crosswind will also increase the cooling tower cooling task, and correspondingly, the cooling tower needs better cooling performance, which is of great significance for understanding the influence of the crosswind on the performance of the cooling tower and guiding the design and modification of the cooling tower.